Im 18, had my tonsillectomy and uppp on thursday, (v-day) so today is day 4. Im a smoker and i have refrained from smoking but i feel like i really need a cigarette. I can drink normally, and eat most soft food, pudding, apple sauce, chicken noodle soup. I have been off my pain meds for about 24 hours now. Would smoking ONE cigarette cause any harm???